Use swarming_client instead of swarm_client.

Modify all the references to use src/tools/swarming_client/.

The build scripts already support both.

R=csharp@chromium.org, torne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/29993003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232104 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232105 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232104
SVN changes up to revision 232105